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♦ <br /> . PC Exhibit F <br /> � 2335 Highway 36 W <br /> St.Paul,MN 55113 <br /> Tel 651-636-4600 <br /> Fax 651-636-1311 <br /> www.bonestroo.wm <br /> . �Bonestroo <br /> August 4, 2008 . <br /> Ms. Evelyn Turner ' <br /> Planner. • � <br /> City of Orono . . • <br /> Post Office Box 66 <br /> Crystal Bay, MN 55323 � � <br /> Re: 505 Willow Drive South - � � ' '" .� � <br /> File No. 000139-08000-1 ` . .. <br /> Plat No. 08-3374 <br /> Dear Evelyn. <br /> • We have reviewetl the preliminary plat and grading plan, dated 7-23-08. The site is located in the <br /> northwest quadrant of the Willow Drive South and Fox Street intersection. We have the following <br /> comments with regards to engineering matters: . <br /> I • The two foot contours provided by the Cify are not reliable enough to accurately develop site <br /> grading plans. The City requires that surveys show actual elevations and contours as shot in the <br /> field. The plans should clearly state the source of the existing contours. An example should be a <br /> � statement similar to: "Existing contours within the project grading limits and adjacent areas <br /> developed from a site survey performed on June 24, 2008.° <br /> Z • The plans should clarify�whether the existing detached garage on Lot 3 will remain, If it is to <br /> remain, the current access from Lot 2 should be removed and graded. This area should be graded <br /> to convey runoff north or south along the property line to the extent possible. • <br /> 3 • Engineered design and details should be submitted for all retaining walls over four feet in height or <br /> for tiered retaining walls that are not horizontally separated by at least two times the taller wall <br /> height. This appears to apply to the proposed retaining wall on Lot 1 on the interior of the <br /> driveway loop. <br /> �f • The grading plan should show the outline or edge of tree covered areas. <br /> � • The city may want to consider looking into the possibility of requiring the Lot 1 driveway to access <br /> Willow Drive instead of Fox Street. The impacts to trees from driveway grading will be much less . <br /> with the Willow Drive option. <br /> � �O • If the driveway for Lot 1 is to connect to Fox Street, Best Management Practices for erosion and . <br /> � sediment control should be employed. An example could be the construction of a rain garden at <br /> the driveway entrance to Fox Street. . <br /> � • The driveway for Lot 1 should have at least 50 feet of two percent grade or less leading up to Fox <br /> Street. <br />